*{
	margin: 0px;
	padding: 0px；
}
.header{
	width: 100%;
	height: 100px;
	background: red;
}
.main{
	width: 100%;
	height: 400px;
	background: gray;
}
.footer{
	width: 100%;
	height: 100px;
	background: yellow;
}
.header_middle{
	width: 1000px;
	height: 100px;
	background: blue;
	margin: 0px auto;
}
.middle_left{
	width: 200px;
	height: 100px;
	background: #22B14C;
	float: left;
}
.middle_right{
	width: 400px;
	height: 100px;
	background: #A349A4;
	float: left;
}
.main_left{
	width: 80%;
	height: 400px;
	background: black;
	float: left;
}
.main_right{
	width: 20%;
	height: 400px;
	background: green;
	float: left;
}